package demoTest;

import org.springframework.util.ConcurrentReferenceHashMap;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;

import java.util.*;

public class MapDemo {

	public static void main(String[] args) {

		Map map = new HashMap();
		Map map2 = new LinkedHashMap();

		WeakHashMap weakHashMap = new WeakHashMap();
		MultiValueMap<String, String> result = new LinkedMultiValueMap();
		result.put("a", Collections.singletonList("a"));

		}
	}

